/*
    Hurry Curry! - a game about cooking
    Copyright 2024 metamuffin

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as published by
    the Free Software Foundation, version 3 of the License only.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.

*/
use hurrycurry_protocol::{
    glam::{IVec2, Vec2},
    ClientGamedata, ItemIndex, TileIndex,
};
use sdl2::{
    pixels::PixelFormatEnum,
    rect::{FRect, Rect},
    render::{BlendMode, Canvas, Texture, TextureAccess, TextureCreator},
    video::{Window, WindowContext},
};
use std::collections::HashMap;

pub struct SpriteRenderer<'a> {
    texture: Texture<'a>,

    tiles: Vec<Rect>,
    items: Vec<Rect>,

    view_scale: Vec2,
    view_offset: Vec2,

    sprites: Vec<DrawItem>,
}

pub struct DrawItem {
    z_order: i32,
    src: Rect,
    dst: FRect,
}

impl<'a> SpriteRenderer<'a> {
    pub fn init(texture_creator: &'a TextureCreator<WindowContext>) -> Self {
        let palette = include_str!("../textures/palette.csv")
            .split('\n')
            .filter(|l| !l.is_empty())
            .map(|s| {
                let mut toks = s.split(",");
                (
                    toks.next().unwrap().chars().next().unwrap(),
                    [
                        toks.next().unwrap().parse::<u8>().unwrap(),
                        toks.next().unwrap().parse::<u8>().unwrap(),
                        toks.next().unwrap().parse::<u8>().unwrap(),
                        toks.next().unwrap().parse::<u8>().unwrap(),
                    ],
                )
            })
            .collect::<HashMap<_, _>>();

        let mut texels = vec![255; 1024 * 1024 * 4];

        for (y, line) in include_str!("../textures/atlas.ta").lines().enumerate() {
            if line.is_empty() {
                continue;
            }
            for (x, char) in line.chars().enumerate() {
                let color = palette.get(&char).unwrap();
                texels[(y * 1024 + x) * 4 + 0] = color[3];
                texels[(y * 1024 + x) * 4 + 1] = color[2];
                texels[(y * 1024 + x) * 4 + 2] = color[1];
                texels[(y * 1024 + x) * 4 + 3] = color[0];
            }
        }

        let mut texture = texture_creator
            .create_texture(
                Some(PixelFormatEnum::RGBA8888),
                TextureAccess::Streaming,
                1024,
                1024,
            )
            .unwrap();

        texture.update(None, &texels, 1024 * 4).unwrap();
        texture.set_blend_mode(BlendMode::Blend);

        Self {
            texture,
            items: vec![],
            tiles: vec![],
            sprites: vec![],
            view_offset: Vec2::ZERO,
            view_scale: Vec2::splat(4.),
        }
    }

    pub fn set_sprite_map(&mut self, data: ClientGamedata) {
        let meta = include_str!("../textures/atlas.meta.csv")
            .lines()
            .filter(|l| !l.is_empty())
            .map(|l| {
                let mut toks = l.split(",");
                let x: i32 = toks.next().unwrap().parse().unwrap();
                let y: i32 = toks.next().unwrap().parse().unwrap();
                let w: u32 = toks.next().unwrap().parse().unwrap();
                let h: u32 = toks.next().unwrap().parse().unwrap();
                let name = toks.next().unwrap().to_string();
                (name, Rect::new(x, y, w, h))
            })
            .collect::<HashMap<_, _>>();

        self.items = data
            .item_names
            .iter()
            .map(|i| meta.get(i).copied().unwrap_or(Rect::new(0, 0, 0, 0)))
            .collect();
        self.tiles = data
            .tile_names
            .iter()
            .map(|i| meta.get(i).copied().unwrap_or(Rect::new(0, 0, 0, 0)))
            .collect();
    }

    pub fn draw_tile(&mut self, TileIndex(i): TileIndex, position: IVec2) {
        let p = self.view_offset + position.as_vec2();
        let src = self.tiles[i];
        self.sprites.push(DrawItem {
            z_order: position.y,
            src,
            dst: FRect::new(
                (p.x * 32.) * self.view_scale.x,
                (p.y * 24. + 24. - src.height() as f32) * self.view_scale.y,
                src.width() as f32 * self.view_scale.x,
                src.height() as f32 * self.view_scale.y,
            ),
        });
    }
    pub fn draw_item(&mut self, ItemIndex(_i): ItemIndex, _position: Vec2) {
        todo!()
    }

    pub fn submit(&mut self, canvas: &mut Canvas<Window>) {
        self.sprites.sort();
        for DrawItem { src, dst, .. } in self.sprites.drain(..) {
            canvas.copy_f(&self.texture, src, dst).unwrap();
        }
    }
}

impl Ord for DrawItem {
    fn cmp(&self, other: &Self) -> std::cmp::Ordering {
        self.z_order.cmp(&other.z_order)
    }
}
impl PartialOrd for DrawItem {
    fn partial_cmp(&self, other: &Self) -> Option<std::cmp::Ordering> {
        Some(self.cmp(&other))
    }
}
impl Eq for DrawItem {}
impl PartialEq for DrawItem {
    fn eq(&self, other: &Self) -> bool {
        self.z_order == other.z_order && self.src == other.src && self.dst == other.dst
    }
}